Abstract
We report polarized absorption spectra for the (2,2) tubes arrayed in the one-dimensional channels of an AlPO4-11 (AEL) single crystal. Strong polarization dependence is observed indicating a preferential optical dipole along the axis of carbon nanotubes. By correlating with the absorption spectra and First-principles local density function (LDA) calculation, the absorption peak at 2.95eV is uniquely assigned to semiconducting type (2,2) tubes, and peaks at 2.67 and 2.40eV are corresponding to metallic type (2,2) tubes.
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